CN113156336B - Method and device for identifying single-tube open-circuit fault of Vienna rectifier in two stages and storage medium - Google Patents
Method and device for identifying single-tube open-circuit fault of Vienna rectifier in two stages and storage medium Download PDFInfo
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Abstract
The application provides a method for identifying a single-tube open-circuit fault of a Vienna rectifier in a two-stage mode, based on the online identification process, after a zero-value stable region occurs, on one hand, whether the current zero-crossing phase has the open-circuit fault or not is detected, and on the other hand, the detection is also started to detect which bridge arm on the zero-crossing phase the current flows and the switching tube has the fault. Under the simultaneous judgment of the two aspects, if the current zero-crossing phase has an open-circuit fault, the current zero-crossing phase can quickly and timely diagnose the open-circuit fault phase and which bridge arm switch has the fault at the same time. In addition, in order to enhance the reliability of the identification step, the method also provides a secondary identification method, and in practical application, the primary identification method and the secondary identification method are carried out synchronously.
Description
Technical Field
The disclosure specifically discloses a method and a device for identifying single-tube open-circuit faults of a Vienna rectifier in a two-stage mode and a storage medium.
Background
The three-phase Vienna rectifier has the advantages of simple structure, small switching stress, low harmonic distortion rate and high reliability, is widely applied to the fields with higher requirements on rectification effects of aviation, electric automobiles and the like, and in practical application, short-circuit faults can cause current to be greatly increased and can be easily found and protected, open-circuit faults can not cause large-amplitude overcurrent and overvoltage and can not be easily identified, but the open-circuit faults can cause deterioration of electrical parameters, and secondary faults can be easily caused by long-time fault operation.
At present, rectifier open-circuit fault diagnosis methods are roughly divided into two types, namely a current characteristic-based method and a voltage characteristic-based method, the current characteristic-based diagnosis methods are influenced by input current fluctuation and load fluctuation, and the voltage characteristic-based diagnosis methods often need additional equipment or complex calculation. Therefore, there is a need to find an accurate, reliable, simple diagnostic method for Vienna rectifiers without additional devices.
Disclosure of Invention
Compared with the diagnosis method in the prior art, the method, the device and the storage medium for identifying the single-tube open-circuit fault of the Vienna rectifier in a double-stage mode are simple in implementation mode and free of complex control, and the accuracy and the reliability of diagnosis can be effectively improved without additionally adding devices.
On one hand, the method for identifying the single-tube open-circuit fault of the Vienna rectifier in a two-stage mode acquires the instantaneous amplitude of three-phase input current of the rectifier in real time, converts the three-phase input current of the rectifier into an alpha-phase current component and a beta-phase current component in a two-phase static coordinate system, and delays the beta-phase current component for a first preset time to enable the beta-phase current component to be consistent with or opposite to the phase of the alpha-phase current component; judging whether alpha phase current components corresponding to three-phase input currents respectively have zero-value stable regions, and if the alpha phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase; when any phase is judged to be a current zero-crossing phase, calculating the zero-value platform duration of the current zero-crossing phase in a second preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase to be an open-circuit fault phase; counting the times that the amplitude of the beta-phase current component corresponding to the current zero crossing is greater than zero and less than zero within a second preset time period of the phase; comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase of the current passes through the switching tube to generate a fault so as to finish primary fault identification; acquiring a periodic output capacitor voltage difference on a rectifier in real time, and performing harmonic analysis on the periodic output capacitor voltage difference to extract a direct current component amplitude of the rectifier; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification; when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result; and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the zero-value platform detection threshold value, and circularly executing the steps until the primary fault identification result appears.
According to the technical scheme provided by the embodiment of the application, the step of judging whether the alpha phase current components respectively corresponding to the three-phase input current have zero-value stable regions comprises the following steps: judging whether the alpha phase current components respectively corresponding to the three-phase input current fall into a zero current detection threshold range or not; and if the alpha phase current component of any phase of input current falls into the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase.
According to the technical scheme provided by the embodiment of the application, when the phases of the alpha-phase current component and the beta-phase current component are consistent, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps: if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
According to the technical scheme provided by the embodiment of the application, when the phases of the alpha-phase current component and the beta-phase current component are opposite, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps: if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
According to the technical scheme provided by the embodiment of the application, the step of automatically reducing the zero-value platform detection threshold value comprises the following steps: setting a zero-valued platform detection threshold to tthAnd the adjusted zero-value platform detection threshold value is t'thThe calculation formula is as follows:
t′th＝tth-0.025KT
wherein: k is a modulation ratio; and T is a power frequency period.
According to the technical scheme provided by the embodiment of the application, the step of determining that the phase is a current zero-crossing phase further comprises the following steps: definition of zero-point flag bits epsilonk：
Wherein: i.e. iαk(k ═ a, b, c) for three-phase input current; i.e. ithDiagnostic threshold i for zero current detectionthεk1 means that the k-phase is a zero-current-passing phase, epsilon k0 represents a k-phase non-current zero-crossing phase;
the step of calculating the zero-value platform duration of the current zero-crossing phase within a second preset time period comprises the following steps: setting a counting module W corresponding to a three-phase input currentk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) operating second presetThe time of the duration; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: t issIs a current sampling period;
the step of determining that the phase is an open-circuit fault phase further includes: definition of fault phase flag bit Fk：
Wherein: t is tthDetecting a threshold for a zero-valued platform; f k1 means that the k-phase is an open-circuit fault phase, F k0 denotes the k-phase non-open-circuit fault phase.
According to the technical scheme provided by the embodiment of the application, the step of counting the times that the amplitude of the beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a second preset time period of the phase includes: setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a second preset time; respectively counting the times that the amplitude of the beta phase current component is greater than zero and the times that the amplitude of the beta phase current component is less than zero within a second preset time period, and when the amplitude of the beta phase current component is greater than zero, Wβk1Adding 1 in an accumulated way; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 in an accumulated way; setting a switch tube diagnosis positioning variable F for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zeroup：
When the phase of the alpha phase current component and the phase of the beta phase current component are identical, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fupIf the current is 0, the lower bridge arm of the current zero-crossing phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fupIf the current is 0, the current passes through the upper bridge arm of the zero phase to cause a fault;
preferably, the switch tube diagnosis positioning variable F is setupAnd Fdown：
When the phase of the alpha phase current component and the phase of the beta phase current component are identical, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fdownIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fdownAnd 1, the current flows through the upper bridge arm fault of the zero phase.
On the other hand, the device for identifying the single-tube open-circuit fault of the Vienna rectifier in two stages comprises a current transformation module, a current detection module and a control module, wherein the current transformation module is used for acquiring the instantaneous amplitude of three-phase input current of the rectifier in real time, transforming the three-phase input current of the rectifier to an alpha phase current component and a beta phase current component in a two-phase static coordinate system, and delaying the beta phase current component for a first preset time length to enable the beta phase current component to be consistent with or opposite to the phase of the alpha phase current component; the current-passing zero-phase judging module is used for judging whether alpha-phase current components corresponding to three-phase input currents respectively have zero-value stable regions or not, and if the alpha-phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase; the primary fault identification module is used for calculating the zero-value platform duration time of the current zero-crossing phase in the second preset time length while judging that any phase is the current zero-crossing phase, comparing the zero-value platform duration time with a zero-value platform detection threshold value, and judging that the phase is an open-circuit fault phase if the zero-value platform detection threshold value is larger than the zero-value platform detection threshold value; counting the times that the amplitude of the beta-phase current component corresponding to the current zero crossing is greater than zero and less than zero within a second preset time period of the phase; comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase has a fault, and finishing primary fault identification; the secondary fault identification module is used for acquiring the voltage difference of a periodic output capacitor on the rectifier in real time and carrying out harmonic analysis on the voltage difference so as to extract the amplitude of a direct current component of the voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification; the comprehensive identification module: when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result; and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the zero-value platform detection threshold value, and circularly executing the steps until the primary fault identification result appears.
In another aspect, the present application further provides a computer device, including: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method for dual stage identification of a Vienna rectifier single tube open circuit fault as described above.
In another aspect, a computer-readable storage medium includes instructions which, when executed on a computer, cause the computer to perform the method for dual stage identification of single tube open fault of a Vienna rectifier as described above.
In summary, the present application discloses a method for identifying single-tube open-circuit faults of a Vienna rectifier at two stages.
According to the technical scheme, on one hand, the acquired instantaneous amplitude of the three-phase input current of the rectifier is converted into the alpha-phase current component and the beta-phase current component under the two-phase static coordinate system in real time, and whether the zero-crossing phenomenon of the current exists in the three-phase input current is judged by analyzing whether the alpha-phase current component corresponding to the three-phase input current exists in the zero-crossing phenomenon. When any phase is determined to be a current zero-crossing phase, the duration time of a zero-value platform of the current flowing through the zero-crossing phase is calculated, the duration time is compared with a zero-value platform detection threshold value to judge whether the current zero-crossing phase really has an open-circuit fault, the times that the amplitude of a beta-phase current component corresponding to the current flowing through the zero-crossing phase is greater than zero and less than zero are counted to judge which bridge arm has the fault, and after the judgment, primary identification is completed, and the result is that which bridge arm of which phase has the open-circuit fault can be judged.
On the other hand, the technical scheme acquires the instantaneous amplitude of the three-phase output voltage of the rectifier in real time and performs harmonic analysis on the instantaneous amplitude to extract the amplitude of the direct-current component of the rectifier; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification; the result can roughly judge whether the collator has single-tube open circuit fault, and the function is to compensate the first-level fault identification and verify whether the single-tube fault of the switching tube occurs.
Aiming at the results of primary fault identification and secondary fault identification, the specific application logic thought of the method is as follows: when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result; and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the zero-value platform detection threshold value, and circularly executing the steps until the primary fault identification result appears.
Based on the above online identification process, after a zero-value stable region occurs, on one hand, whether the current zero-crossing phase has an open-circuit fault or not is detected, and at the same time, on the other hand, the switching tube of which bridge arm on the zero-crossing phase the current flows is also detected to have a fault. Under the simultaneous judgment of the two aspects, if the current zero-crossing phase has an open-circuit fault, the current zero-crossing phase can quickly and timely diagnose the open-circuit fault phase and which bridge arm switch has the fault at the same time. In addition, in order to enhance the reliability of the identification step, a secondary identification method is further provided, in practical application, the primary identification method and the secondary identification method are carried out synchronously, and under the condition of high-efficiency logic judgment, compared with the prior art, the technical scheme provided by the application has the advantages that on one hand, no additional sensor is required to be added, no hardware change is required, and only corresponding processing and analysis are carried out on three-phase input current and three-phase output voltage, so that the on-line identification of the single-tube open-circuit fault of the Vienna rectifier can be realized; on the other hand, when the open-circuit fault phase and the switching tube of the bridge arm on the open-circuit fault phase are judged to have a fault, synchronous statistics is carried out simultaneously within a first preset time length, and the first-stage fault identification can be rapidly and efficiently diagnosed; and the analysis of the three-phase output voltage is also carried out in real time, so that the primary fault identification and the secondary fault identification can also ensure the rapidness, the high efficiency and the reliability.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of a three-phase six-switch Vienna rectifier topology structure.
Fig. 2 is a schematic diagram of a logic structure of a method for identifying a single-tube open-circuit fault of a Vienna rectifier at two stages.
The simulation results of the fault phase location obtained according to the method of fig. 2 are shown in fig. 3.
Fig. 4 shows simulation results of the bridge arm positioning obtained according to the method in fig. 2.
Fig. 5 is a graph showing harmonic analysis before and after the open-circuit fault of the Vienna rectifier in fig. 1.
Fig. 6 shows the test results of fault phase location and bridge arm location during Vienna open-circuit rectification fault in fig. 1.
The test results of the Vienna rectification fault diagnosis in fig. 1 when the load changes are shown in fig. 7.
FIG. 8 is a schematic diagram of a hardware configuration of a computer device;
FIG. 9 is a schematic diagram of the logical operation of the computer device.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The present invention will be described in detail with reference to the accompanying drawings and examples. Fig. 1 is a schematic diagram of a three-phase six-switch Vienna rectifier topology structure. Wherein:
Sk1is an upper bridge arm, Sk2The lower arm (k is a, b, c).
Three-phase input current ia、ib、icThe sensor can be obtained through a Vienna rectifier.
Output capacitor voltage uc1And uc2The sensor can be obtained through a Vienna rectifier.
The application specifically provides a specific implementation mode of a method for identifying single-tube open-circuit faults of a Vienna rectifier in a two-stage mode, and the method comprises the following steps:
the method comprises the steps of acquiring the instantaneous amplitude of three-phase input current of a rectifier in real time, converting the three-phase input current of the rectifier into an alpha-phase current component and a beta-phase current component under a two-phase static coordinate system, and delaying the beta-phase current component for a first preset time period to enable the beta-phase current component to be consistent with or opposite to the phase of the alpha-phase current component; judging whether alpha phase current components corresponding to three-phase input currents respectively have zero-value stable regions, and if the alpha phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase; the first predetermined period of time is preferably 0.75T or 0.25T. Specifically, the manner of obtaining the instantaneous amplitude of the three-phase input current in this step may be a sensor provided in the rectifier. Specifically, the α -phase current component and the β -phase current component in the three-phase input current converted to the two-phase stationary coordinate system in this step may be converted as follows:
in this step, optionally, the step of determining whether the α -phase current components respectively corresponding to the three-phase input currents have a zero-value stable region includes: judging whether the alpha phase current components respectively corresponding to the three-phase input current fall within a zero current detection threshold range or not; and if the alpha phase current component of any phase of input current falls into the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase. Specifically, the zero current detection threshold range is (-i)th，ith) Optionally, the said ithThe recognition accuracy is affected, and preferably, the value is selected to be around 10% of the peak current. If measured to be iαkThe value of (k ═ a, b, c) is in the interval (-i)th，ith) In the range, k (k ═ a, b, c) phase input current zero-crossing is represented; otherwise, it means that the k (k ═ a, b, c) phase input current does not cross zero.
Preferably, the step of determining that the phase is a current zero-crossing phase further includes: define the zero flag ε k:
wherein: i.e. iαk(k ═ a, b, c) for three-phase input current; i all right anglethDiagnostic threshold i for zero current detectionthεk1 means that the k phase is a current zero-crossing phase, epsilon k0 denotes a k-phase non-current zero-crossing phase.
Definition of zero-point flag bits epsilonkThe current zero-phase can be conveniently reflected, and the logic operation in the later period is facilitated.
When any phase is judged to be a current zero-crossing phase, further processing needs to be carried out on the current zero-crossing phase, namely primary fault identification is completed, and the method specifically comprises the following steps:
calculating the zero-value platform duration of the current zero-crossing phase within a second preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase as an open-circuit fault phase; the judgment result of the step is as follows: which leg of which phase has an open circuit fault. Specifically, in this step, the step of calculating the zero-value plateau duration of the zero-crossing phase of the current within the second preset time period includes: setting a counting module W corresponding to a three-phase input currentk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) for a second preset duration of time; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: t issFor the current sampling period, 0.0001s may be selected.
Optionally, the second preset duration is a power frequency period of 1/4, such as: 0.005 s. Of course, the power frequency cycle with the second preset duration of 1/4 is an optimal value, and the value range thereof may be (0.004s-0.007s), and an excessive value of the second preset duration may cause a delay in the fault diagnosis time, as can be seen from the current waveform diagram shown in fig. 2, a zero-value platform appears periodically, and if the second preset duration is too large, the duration of the zero-value platform is exceeded, and in the exceeded time, W is within the duration of WkIt is not accumulated; but t cannot be calculated because t is still within the second preset time lengthkThat is, it cannot be finally determined whether the phase is an open-circuit fault phase, which eventually results in a delay in fault diagnosis time.
The second preset duration is too small, so that the missed diagnosis is caused, because when the second preset duration is very small, the working time of the counting module is too short, the counting value is too small, and when the counting module works for the second preset duration, the counting module starts to clear and count again to enable the counting module to work for the second preset durationCalculated zero-valued plateau duration tk＝WkTsK is too small to reach the failure threshold all the time, resulting in missed diagnosis.
Based on the step, whether the phase is the open-circuit fault phase or not can be finally determined, and the step of determining the phase as the open-circuit fault phase for the convenience of identification further comprises the following steps: definition of fault phase flag bit Fk：
Wherein: t is tthA zero-value platform detection threshold value can be selected to be 0.2T, and T is a power frequency period; f k1 denotes that k phase is an open-circuit failure phase, F k0 indicates a k-phase non-open-circuit fault phase.
Definition of fault phase flag bit FkThe current zero-phase can be conveniently reflected, and the logic operation in the later period is facilitated.
When any phase is judged to be a current-passing zero phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a second preset time period of the phase; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase of the current passes through the switching tube to generate a fault so as to finish primary fault identification.
Specifically, in a preferred embodiment, when the phases of the α -phase current component and the β -phase current component are consistent, the step of comparing the number of times that the magnitude of the β -phase current component is greater than zero with the number of times that the magnitude of the β -phase current component is less than zero includes: if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
Specifically, in a preferred embodiment, the step of comparing the number of times that the magnitude of the β -phase current component is greater than zero with the number of times that the magnitude of the β -phase current component is less than zero when the phases of the α -phase current component and the β -phase current component are opposite to each other comprises: if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
Specifically, the step of counting the number of times that the amplitude of the β -phase current component corresponding to the zero crossing of the current is greater than zero and the number of times that the amplitude of the β -phase current component is less than zero within a second preset time period includes: setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a second preset time; respectively counting the times that the amplitude of the beta phase current component is greater than zero and the times that the amplitude of the beta phase current component is less than zero within a second preset time period, and when the amplitude of the beta phase current component is greater than zero, Wβk1Adding 1 in an accumulated way; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 cumulatively; setting a switch tube diagnosis positioning variable F for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zeroup：
When the phase of the alpha phase current component and the phase of the beta phase current component are identical, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fupIf the current is 0, the lower bridge arm of the current zero-crossing phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fupIf the current is 0, the current passes through the upper bridge arm of the zero phase to cause a fault;
preferably, a switch tube diagnostic positioning variable F is setupAnd Fdown：
When the phase of the alpha phase current component and the phase of the beta phase current component are identical, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fdownIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fdownAnd 1, the current flows through the upper bridge arm fault of the zero phase.
Acquiring a periodic output capacitor voltage difference on a rectifier in real time, and performing harmonic analysis on the periodic output capacitor voltage difference to extract a direct-current component amplitude of the periodic output capacitor voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification; in this step, the output capacitor voltage u is obtained in real timec1And uc2The voltage difference of the output capacitor of the rectifier can be obtained by a sensor of the Vienna rectifier, the difference of the Vienna rectifier and the Vienna rectifier can be calculated to obtain the voltage difference of the output capacitor of the rectifier, and harmonic analysis is carried out on the voltage difference of the output capacitor of the rectifier to extract the amplitude of the direct current component of the voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the detection threshold of the direct current component, the rectifier is judged to have a single-tube open-circuit fault, and specifically, a secondary fault identification flag bit F is defined:
wherein: if F is equal to 1, a single-tube open-circuit fault occurs; if F is equal to 0, no single-tube open-circuit fault exists; preferably, the discrimination threshold is set to UthSpecifically, the discrimination threshold value UthCan be obtained by the following steps: obtaining the DC component amplitude of the output capacitance voltage difference when the single-tube open-circuit fault does not occur and the DC component amplitude of the output capacitance voltage difference when the single-tube open-circuit fault occurs, and taking the intermediate value between the two as a discrimination threshold Uth。
And defining a secondary fault identification flag bit F, which is favorable for operation by combining a primary fault identification result.
After the primary fault identification result and the secondary fault identification result are obtained, the following judgment is carried out in real time: please refer to fig. 2, which illustrates a logic structure diagram of dual-stage identification of single-tube open-circuit fault of the Vienna rectifier.
When the primary fault identification result is earlier than the secondary fault identification result, the primary fault identification result is taken as a final judgment result, namely, which bridge arm on which phase sends the open-circuit fault is known.
When the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing a zero-value platform detection threshold value; in this step, it is known that a single-tube open-circuit fault occurs through a capacitance voltage difference, but when a primary fault is identified, it is not detected which bridge arm on which phase sends an open-circuit fault, so that a zero-value platform detection threshold needs to be adjusted, specifically, the step of automatically reducing the zero-value platform detection threshold includes: setting a zero-valued plateau detection threshold to tthAnd the adjusted zero-value platform detection threshold value is t'thThe calculation formula is as follows:
t′th＝tth-0.025KT
wherein: k is the modulation ratio, i.e.: is the ratio of the effective value of the DC output voltage to the effective value of the AC input voltage; and T is a power frequency period.
And circularly executing the steps until a primary fault identification result appears.
Based on the above online identification process, after a zero-value stable region occurs, on one hand, whether the current zero-crossing phase has an open-circuit fault or not is detected, and at the same time, on the other hand, the switching tube of which bridge arm on the zero-crossing phase the current flows is also detected to have a fault. Under the simultaneous judgment of the two aspects, if the current zero-crossing phase has an open-circuit fault, the current zero-crossing phase can quickly and timely diagnose the open-circuit fault phase and which bridge arm switch has the fault at the same time.
In order to enhance the reliability of the identification steps, the method also provides a secondary identification method, in practical application, the primary identification method and the secondary identification method are carried out synchronously, and compared with the prior art, under the condition of high-efficiency logic judgment, the technical scheme provided by the application has the advantages that on one hand, no additional sensor is needed to be added, no hardware change is needed, and only the corresponding processing and analysis are carried out on the three-phase input current and the three-phase output voltage, the single-tube open-circuit fault on-line identification of the Vienna rectifier can be realized; on the other hand, when the open-circuit fault phase and the switching tube of the bridge arm on the open-circuit fault phase are judged to have a fault, synchronous statistics is carried out simultaneously within a first preset time length, and the first-stage fault identification can be rapidly and efficiently diagnosed; and the analysis of the three-phase output voltage is also carried out in real time, so that the primary fault identification and the secondary fault identification can also ensure the rapidness, the high efficiency and the reliability.
In a specific application scenario, the fault setting is set at 0.1S for Sa1And (4) opening the circuit.
Please refer to fig. 3, which shows the simulation result of the fault phase location obtained according to the above method. When the fault occurs at 0.1s, a zero value platform appears, namely a counter WaRapidly increasing, after a second preset duration, i.e. after the diagnostic time shown in the figure, FaAnd 5, judging that the phase a is an open-circuit fault phase.
Please refer to fig. 4, which shows the simulation result of the bridge arm positioning obtained according to the above method. When the fault occurs at 0.1s, a zero value platform appears, namely a counter Wβk1Rapidly increasing, after a second preset duration, i.e. after the diagnostic time shown in the figure, FupAnd (4) 1, the upper bridge arm switching tube has an open circuit fault.
As summarized above, in the primary recognition result, Sa1An open circuit fault occurs.
Please refer to the harmonic analysis chart before and after the open circuit fault occurs shown in fig. 5. Fig. 5 shows that the harmonic content changes before and after the fault occurs, and the theoretical basis that the direct current component is obviously increased when the fault occurs is verified.
Please refer to fig. 6, which shows the test results of the fault phase location and the bridge arm location during the open circuit fault. As can be seen from FIG. 6, at Sa1When open-circuit fault occurs, FaAnd F is 0, after the diagnosis time, F is 1, the occurrence of the missing diagnosis is proved, the detection threshold value of the zero-value platform is adjusted internally, and then the diagnosis of the primary fault identification result is successful.
As can be seen from fig. 6, when the first-stage fault identification fails to perform diagnosis, the second-stage fault identification functions to avoid the diagnosis failure.
Please refer to the test results of the fault diagnosis when the load suddenly changes from 100 ohms to 50 ohms as shown in fig. 7. As can be seen from fig. 7, the load disturbance does not cause misdiagnosis.
The application still provides a device that Vienna rectifier single tube open circuit trouble was discerned to doublestage, and the concrete implementation mode includes:
the current transformation module is used for acquiring the instantaneous amplitude of the three-phase input current of the rectifier in real time, transforming the three-phase input current of the rectifier to an alpha-phase current component and a beta-phase current component under a two-phase static coordinate system, and delaying the beta-phase current component for a first preset time so that the beta-phase current component and the alpha-phase current component are consistent in phase or are mutually opposite;
the current-passing zero-phase judging module is used for judging whether alpha-phase current components corresponding to three-phase input currents respectively have zero-value stable regions or not, and if the alpha-phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase;
the primary fault identification module is used for calculating the zero-value platform duration time of the current zero-crossing phase in the second preset time length while judging that any phase is the current zero-crossing phase, comparing the zero-value platform duration time with a zero-value platform detection threshold value, and judging that the phase is an open-circuit fault phase if the zero-value platform detection threshold value is larger than the zero-value platform detection threshold value; counting the times that the amplitude of the beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a second preset time period; comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase of the current passes through the switching tube to generate a fault so as to finish primary fault identification;
the secondary fault identification module is used for acquiring the voltage difference of a periodic output capacitor on the rectifier in real time and carrying out harmonic analysis on the voltage difference so as to extract the amplitude of a direct current component of the voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification;
the comprehensive identification module: when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result; and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the zero-value platform detection threshold value, and circularly executing the steps until the primary fault identification result appears.
Based on the method, the current transformation module, the current zero-crossing phase judgment module, the primary fault identification module, the secondary fault identification module and the comprehensive identification module are used for respectively realizing corresponding functions, and the online identification method can be manufactured into a transportable device and can be conveniently arranged in the existing application scene using the VIENNA rectifier.
The present application further provides a computer device, the device comprising: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method for dual-stage identification of single-tube open fault of the Vienna rectifier as described above. Please refer to the hardware structure diagram of the computer device shown in fig. 8 and the logic operation diagram of the computer device shown in fig. 9.
The computer system includes a Central Processing Unit (CPU)501, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM)502 or a program loaded from a storage section into a Random Access Memory (RAM) 503. In the RAM503, various programs and data necessary for system operation are also stored. The CPU 501, ROM 502, and RAM503 are connected to each other through a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.
The following components are connected to the I/O interface 505: an input portion 506 including a keyboard, a mouse, and the like; an output section including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage portion 508 including a hard disk and the like; and a communication section 509 including a network interface card such as a LAN card, a modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The drives are also connected to the I/O interface 505 as needed. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as necessary, so that a computer program read out therefrom is mounted on the storage section 508 as necessary.
In particular, according to an embodiment of the present invention, the process described above in the method for double-stage identification of Vienna rectifier single-tube open circuit fault may be implemented as a computer software program. For example, an embodiment of the present invention related to a method for dual stage identification of a Vienna rectifier single tube open circuit fault includes a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium. The above-described functions defined in the system of the present application are executed when the computer program is executed by the Central Processing Unit (CPU) 501.
It should be noted that the computer readable medium shown in the present invention can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of various dual-stage Vienna rectifier single-tube open circuit fault identification methods, apparatus, and computer program products according to the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present invention may be implemented by software or hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves. The described units or modules may also be provided in a processor, and may be described as: a processor comprises a first generation module, an acquisition module, a search module, a second generation module and a merging module. Wherein the designation of a unit or module does not in some way constitute a limitation of the unit or module itself.
As another aspect, the present application also provides a computer-readable medium, which may be contained in the electronic device described in the above embodiment; or may exist separately without being assembled into the electronic device. The computer readable medium carries one or more programs, and when the one or more programs are executed by an electronic device, the electronic device implements the method for identifying the single-tube open-circuit fault of the Vienna rectifier in the two-stage mode as described in the above embodiments.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A method for identifying single-tube open-circuit faults of a Vienna rectifier in a two-stage mode is characterized by comprising the following steps:
the method comprises the steps of acquiring the instantaneous amplitude of three-phase input current of a rectifier in real time, converting the three-phase input current of the rectifier into alpha-phase current component and beta-phase current component under a two-phase static coordinate system, and delaying the beta-phase current component for a first preset time period to enable the beta-phase current component to be consistent with or opposite to the alpha-phase current component in phase;
judging whether alpha phase current components corresponding to three-phase input currents respectively have zero-value stable regions, and if the alpha phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase;
when any phase is judged to be a current zero-crossing phase, calculating the zero-value platform duration of the current zero-crossing phase in a second preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase to be an open-circuit fault phase; counting the times that the amplitude of the beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a second preset time period of the phase; comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase has a fault, and finishing primary fault identification;
acquiring a periodic output capacitor voltage difference on a rectifier in real time, and performing harmonic analysis on the periodic output capacitor voltage difference to extract a direct-current component amplitude of the periodic output capacitor voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification;
when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result;
and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the zero-value platform detection threshold value, and circularly executing the steps until the primary fault identification result appears.
2. The method for the double-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 1, wherein the method comprises the following steps:
the step of judging whether the alpha phase current components respectively corresponding to the three-phase input current have zero value stable regions or not comprises the following steps: judging whether the alpha phase current components respectively corresponding to the three-phase input current fall within a zero current detection threshold range or not; and if the alpha phase current component of any phase of input current falls into the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase.
3. The method for the double-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 1 or 2, wherein the method comprises the following steps:
when the phases of the alpha-phase current component and the beta-phase current component are consistent, the step of comparing the times that the amplitude of the beta-phase current component is larger than zero with the times that the amplitude of the beta-phase current component is smaller than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
4. The method for the double-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 1 or 2, wherein the method comprises the following steps:
when the phases of the alpha-phase current component and the beta-phase current component are opposite to each other, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
5. The method for the double-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 1 or 2, wherein the method comprises the following steps:
the step of automatically reducing the zero-valued plateau detection threshold comprises: setting a zero-valued platform detection threshold to tthAnd the adjusted zero-value platform detection threshold value is t'thThe calculation formula is as follows:
t′th＝tth-0.025KT
wherein: k is a modulation ratio; and T is a power frequency period.
6. The method for the double-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 1 or 2, wherein the method comprises the following steps:
the step of determining that the phase is a current zero-crossing phase further comprises: zero point flag bit epsilonk：
Wherein: i.e. iαk(k ═ a, b, c) is the three-phase input current; i.e. ithDiagnostic threshold i for zero current detectionth
εk1 means that the k phase is a current zero-crossing phase, epsilonk0 represents a k-phase non-current zero-crossing phase;
the step of calculating the zero-value platform duration of the current zero-crossing phase within a second preset time period comprises the following steps:
setting a counting module W corresponding to a three-phase input currentk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) for a second preset duration of time; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: t is a unit ofsIs a current sampling period;
the step of determining that the phase is an open-circuit fault phase further includes: definition of fault phase flag bit Fk：
Wherein: t is tthA zero-valued platform detection threshold; fk1 denotes that k phase is an open-circuit failure phase, Fk0 denotes the k-phase non-open-circuit fault phase.
7. The method for the two-stage identification of the single-tube open-circuit fault of the Vienna rectifier according to claim 6, wherein the method comprises the following steps:
the step of counting the times that the amplitude of the beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a second preset time period includes:
setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a second preset time;
respectively counting the times that the amplitude of the beta phase current component is greater than zero and the times that the amplitude of the beta phase current component is less than zero within a second preset time period, and when the amplitude of the beta phase current component is greater than zero, Wβk1Adding 1 cumulatively; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 in an accumulated way;
setting a switch tube diagnosis positioning variable F for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zeroup：
When the phase of the alpha phase current component and the phase of the beta phase current component are coincident, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fupIf the current is 0, the lower bridge arm of the current zero-crossing phase fails;
when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fupIf the current is 0, the current passes through the upper bridge arm of the zero phase to cause a fault;
preferably, the switch tube diagnosis positioning variable F is setupAnd Fdown：
When the phase of the alpha phase current component and the phase of the beta phase current component are identical, FupIf the current is 1, the current passes through the upper bridge arm fault of the zero phase; fdownIf the current is 1, the lower bridge arm of the current zero-crossing phase fails;
when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, FupIf the current is 1, the lower bridge arm of the current zero-crossing phase fails; fdownAnd 1, the current flows through the upper bridge arm fault of the zero phase.
8. The utility model provides a device of Vienna rectifier single tube open circuit trouble is discerned to doublestage which characterized in that:
the current transformation module is used for acquiring the instantaneous amplitude of the three-phase input current of the rectifier in real time, transforming the three-phase input current of the rectifier to an alpha-phase current component and a beta-phase current component under a two-phase static coordinate system, and delaying the beta-phase current component for a first preset time so that the beta-phase current component and the alpha-phase current component are consistent in phase or are mutually opposite;
the current-passing zero-phase judging module is used for judging whether alpha-phase current components corresponding to three-phase input currents respectively have zero-value stable regions or not, and if the alpha-phase current components corresponding to any phase of input current have the zero-value stable regions, judging that the phase is a current zero-crossing phase;
the primary fault identification module is used for calculating the zero-value platform duration time of the current zero-crossing phase within a second preset time length when any phase is judged to be a current zero-crossing phase, comparing the zero-value platform duration time with a zero-value platform detection threshold value, and judging the phase to be an open-circuit fault phase if the zero-value platform detection threshold value is larger than the zero-value platform detection threshold value; counting the times that the amplitude of the beta-phase current component corresponding to the current zero crossing is greater than zero and less than zero within a second preset time period of the phase; comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero to judge which bridge arm on the zero phase has a fault, and finishing primary fault identification;
the secondary fault identification module is used for acquiring the voltage difference of a periodic output capacitor on the rectifier in real time and carrying out harmonic analysis on the voltage difference so as to extract the amplitude of a direct current component of the voltage difference; when the amplitude of the direct current component of the voltage difference of the output capacitor is larger than the direct current component detection threshold, judging that the rectifier has a single-tube open-circuit fault, and finishing secondary fault identification;
the comprehensive identification module: when the primary fault identification result is earlier than the secondary fault identification result, taking the primary fault identification result as a final judgment result; and when the primary fault identification result does not appear but the secondary fault identification result appears, automatically reducing the detection threshold value of the zero-value platform, and completing the primary fault identification again until the primary fault identification result appears.
9. A computer device, the device comprising: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method of dual stage identification of a Vienna rectifier single tube open circuit fault of any one of claims 1 to 7.
10. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of dual stage identification of a Vienna rectifier single tube open circuit fault of any of claims 1 to 7.
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| CN113156337B (en) | 2022-06-17 |
| CN113156336A (en) | 2021-07-23 |
| CN113156337A (en) | 2021-07-23 |
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